When you say you have "missing spots in your shift pattern" what does that mean???
Do you mean it will not go into all the gears????
As far as the engine rebuild.
Try to get the engine on a table up off of the floor.
Provide a table to put the parts on.
Go get a box of clear plastic bags to put parts in and a magic marker to label the parts.
Just take one step at a time and follow the instructions in the manual.
If there is something you do not under stand ASK. First or it can $$$$you.
WE all learn one step at a time.
On a Roadstar Adventure.